MP3 to AAC
Convert MP3 audio to AAC in your browser. Choose a bitrate and convert multiple files. Nothing is uploaded.
How it works
- 1Choose one or more audio files.
- 2Pick an output format and a bitrate for lossy audio.
- 3Convert, then download the result or a ZIP of all files.
Other conversions
About this tool
Turn MP3 files into AAC. Choose a bitrate to balance file size and quality. MP3 uses lossy compression. A higher bitrate makes a larger file but cannot restore detail already removed from the source. AAC is a lossy audio codec. Choose a bitrate for size and quality; the result does not preserve detail discarded by an earlier encode.
Convert audio to MP3, WAV, M4A, AAC, OGG, Opus or FLAC in your browser, with bitrate controls for lossy outputs. Change audio format, choose a bitrate for compressed outputs and convert several files at once. OGG inputs can contain Vorbis or Opus; OGG outputs use Opus.
Questions
Does MP3 to AAC improve audio quality?
MP3 uses lossy compression. A higher bitrate makes a larger file but cannot restore detail already removed from the source. AAC is a lossy audio codec. Choose a bitrate for size and quality; the result does not preserve detail discarded by an earlier encode. Conversion cannot improve source quality. Input decoding depends on your browser.
Which formats are supported?
MP3, WAV, M4A/AAC, OGG with Vorbis or Opus, Opus and FLAC can be read when your browser supports decoding their audio. Outputs are MP3, WAV, M4A/AAC, OGG with Opus, Opus and FLAC. Vorbis encoding is not available.
What bitrate should I choose?
128 kbps suits speech and smaller music files. 192 or 256 kbps keeps more detail. A higher bitrate makes a larger file and cannot restore detail already lost.
Does converting to WAV or FLAC improve quality?
No. They avoid another round of lossy compression, but cannot recover detail from an MP3 or other lossy source. WAV output uses 16-bit PCM.
Can I convert WMA, AMR or AIFF?
These formats are tried using your browser's audio decoder. If it cannot read them, this tool explains the limitation. WMA and AMR usually need a separate converter.
Are files uploaded?
No. Decoding and encoding happen in your browser tab. Large files need enough memory on your device.
docshift is a collection of free PDF, image, video, audio and data tools. File processing runs in your browser; files are never uploaded.